Model-independent test of T violation in neutrino oscillations

TL;DR

This paper proposes a largely model-independent method to test T violation in neutrino oscillations by comparing transition probabilities at different baselines, potentially feasible with upcoming experiments.

Contribution

It introduces a general parametrization of neutrino flavor transition probabilities applicable to many new physics scenarios for T violation testing.

Findings

Test can be performed with three baseline experiments.

Method is feasible with upcoming neutrino experiments.

Provides a model-independent approach to T violation detection.

Abstract

We propose a method to establish time reversal symmetry violation at future neutrino oscillation experiments in a largely model-independent way. We introduce a general parametrization of flavour transition probabilities which holds under weak assumptions and covers a large class of new-physics scenarios. This can be used to search for the presence of T-odd components in the transition probabilities by comparing data at different baselines but at the same neutrino energies. We show that this test can be performed already with experiments at three different baselines and might be feasible with experiments under preparation/consideration.